Structure and Phase Transition of Josephson Vortices in Anisotropic High- Tc Superconductors

Xiao Hu; Masashi Tachiki

doi:10.1103/PhysRevLett.80.4044

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Structure and Phase Transition of Josephson Vortices in Anisotropic High- Tc Superconductors

Xiao Hu, Masashi Tachiki

DOI 10.1103/PhysRevLett.80.4044 · Physical Review Letters

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Abstract

Monte Carlo simulation is performed on high- Tc superconductors in a magnetic field ⊥c^. By monitoring the temperature dependence of the helicity modulus and the specific heat, we have demonstrated a second-order phase transition, in the universality class of the 3D XY model, between phases of finite resistivity and of zero ab-plane resistivity. Josephson-vortex lattice, glass, and chains waving along the c axis are obtained at lower temperatures depending on the anisotropy and the magnetic field. These results are discussed in consistency with experimental observations.